Whose discovery of streptomycin stimulated an intense search for other antibiotics?

A. Ehrlich
B. Waksman
C. Pasteur
D. Fleming


Answer: B

Biology & Microbiology

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Even though the autumn may be unusually warm, the leaves from deciduous trees begin to drop during September

Which of the following is the best explanation? a. The trees are responding to shorter days. b. The autumn months are usually wetter because the summer rains were delayed. c. The effects of phototropism are operating "right on schedule." d. There is not enough sunlight to carry on photosynthesis any longer.

e. The trees are responding to consistent temperatures.

Biology & Microbiology

Substances that are naturally produced by certain microorganisms that can inhibit or destroy bacteria are called ________.

A. synthetic drugs B. semisynthetic drugs C. narrow-spectrum drugs D. antibiotics E. broad-spectrum drugs

Biology & Microbiology

Identify two hormones that are involved in regulating blood pressure and briefly describe the role of

each. What will be an ideal response?

Biology & Microbiology

Which of the following substances is secreted by an endocrine gland?

a. Tears b. Breast milk c. Wax d. Saliva e. Hormones

Biology & Microbiology